Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG

A. Sazonov; Chin Keong Ho; J.W.M. Bergmans; J.B.A.M. Arends; P.A.M. Griep; E.A. Verbitskiy; P.J.M. Cluitmans; P.A.J.M. Boon

Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG

A. Sazonov, Chin Keong Ho, J.W.M. Bergmans, J.B.A.M. Arends, P.A.M. Griep, E.A. Verbitskiy, P.J.M. Cluitmans, P.A.J.M. Boon

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

The phase locking index (PLI) was introduced to quantify in a statistical sense the phase synchronization of two signals. It has been commonly used to process biosignals. In this paper, we analyze the PLI for measuring the interdependency of cortical source signals (CSSs) recorded in the Electroencephalogram (EEG). The main focus of the analysis is the probability density function, which describes the sensitivity of the PLI to the joint noise ensemble in the CSSs. Since this function is mathematically intractable, we derive approximations and analyze them for a simple analytical model of the CSS mixture in the EEG. The accuracies of the approximate probability density functions (APDFs) are evaluated using simulations for the model. The APDFs are found sufficiently accurate and thus are applicable for practical intents and purposes. They can hence be used to determine the confidence intervals and significance levels for detection methods for interdependencies, e.g., between cortical signals recorded in the EEG

Original language	English
Title of host publication	Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France
Place of Publication	Lyon
Publisher	Institute of Electrical and Electronics Engineers
Pages	1985-1991
Publication status	Published - 2007
Event	29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2007 - Lyon, France Duration: 23 Aug 2007 → 26 Aug 2007 Conference number: 29

Conference

Conference	29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2007
Abbreviated title	EMBC 2007
Country/Territory	France
City	Lyon
Period	23/08/07 → 26/08/07

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Sazonov, A., Ho, C. K., Bergmans, J. W. M., Arends, J. B. A. M., Griep, P. A. M., Verbitskiy, E. A., Cluitmans, P. J. M., & Boon, P. A. J. M. (2007). Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG. In Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France (pp. 1985-1991). Institute of Electrical and Electronics Engineers.

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title = "Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG",

abstract = "The phase locking index (PLI) was introduced to quantify in a statistical sense the phase synchronization of two signals. It has been commonly used to process biosignals. In this paper, we analyze the PLI for measuring the interdependency of cortical source signals (CSSs) recorded in the Electroencephalogram (EEG). The main focus of the analysis is the probability density function, which describes the sensitivity of the PLI to the joint noise ensemble in the CSSs. Since this function is mathematically intractable, we derive approximations and analyze them for a simple analytical model of the CSS mixture in the EEG. The accuracies of the approximate probability density functions (APDFs) are evaluated using simulations for the model. The APDFs are found sufficiently accurate and thus are applicable for practical intents and purposes. They can hence be used to determine the confidence intervals and significance levels for detection methods for interdependencies, e.g., between cortical signals recorded in the EEG",

author = "A. Sazonov and Ho, \{Chin Keong\} and J.W.M. Bergmans and J.B.A.M. Arends and P.A.M. Griep and E.A. Verbitskiy and P.J.M. Cluitmans and P.A.J.M. Boon",

year = "2007",

language = "English",

pages = "1985--1991",

booktitle = "Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France",

publisher = "Institute of Electrical and Electronics Engineers",

address = "United States",

note = "29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2007, EMBC 2007 ; Conference date: 23-08-2007 Through 26-08-2007",

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Sazonov, A, Ho, CK, Bergmans, JWM, Arends, JBAM, Griep, PAM, Verbitskiy, EA, Cluitmans, PJM & Boon, PAJM 2007, Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG. in Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France. Institute of Electrical and Electronics Engineers, Lyon, pp. 1985-1991, 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2007, Lyon, France, 23/08/07.

Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG. / Sazonov, A.; Ho, Chin Keong; Bergmans, J.W.M. et al.
Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France. Lyon: Institute of Electrical and Electronics Engineers, 2007. p. 1985-1991.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG

AU - Sazonov, A.

AU - Ho, Chin Keong

AU - Bergmans, J.W.M.

AU - Arends, J.B.A.M.

AU - Griep, P.A.M.

AU - Verbitskiy, E.A.

AU - Cluitmans, P.J.M.

AU - Boon, P.A.J.M.

N1 - Conference code: 29

PY - 2007

Y1 - 2007

N2 - The phase locking index (PLI) was introduced to quantify in a statistical sense the phase synchronization of two signals. It has been commonly used to process biosignals. In this paper, we analyze the PLI for measuring the interdependency of cortical source signals (CSSs) recorded in the Electroencephalogram (EEG). The main focus of the analysis is the probability density function, which describes the sensitivity of the PLI to the joint noise ensemble in the CSSs. Since this function is mathematically intractable, we derive approximations and analyze them for a simple analytical model of the CSS mixture in the EEG. The accuracies of the approximate probability density functions (APDFs) are evaluated using simulations for the model. The APDFs are found sufficiently accurate and thus are applicable for practical intents and purposes. They can hence be used to determine the confidence intervals and significance levels for detection methods for interdependencies, e.g., between cortical signals recorded in the EEG

AB - The phase locking index (PLI) was introduced to quantify in a statistical sense the phase synchronization of two signals. It has been commonly used to process biosignals. In this paper, we analyze the PLI for measuring the interdependency of cortical source signals (CSSs) recorded in the Electroencephalogram (EEG). The main focus of the analysis is the probability density function, which describes the sensitivity of the PLI to the joint noise ensemble in the CSSs. Since this function is mathematically intractable, we derive approximations and analyze them for a simple analytical model of the CSS mixture in the EEG. The accuracies of the approximate probability density functions (APDFs) are evaluated using simulations for the model. The APDFs are found sufficiently accurate and thus are applicable for practical intents and purposes. They can hence be used to determine the confidence intervals and significance levels for detection methods for interdependencies, e.g., between cortical signals recorded in the EEG

M3 - Conference contribution

SP - 1985

EP - 1991

BT - Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France

PB - Institute of Electrical and Electronics Engineers

CY - Lyon

T2 - 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2007

Y2 - 23 August 2007 through 26 August 2007

ER -

Sazonov A, Ho CK, Bergmans JWM, Arends JBAM, Griep PAM, Verbitskiy EA et al. Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG. In Proceedings of the 29th Annual International Conference of the IEEE-EMBS, 23-26 August 2007, Lyon, France. Lyon: Institute of Electrical and Electronics Engineers. 2007. p. 1985-1991

Analysis of the Phase Locking Index for Measuring of Interdependency of Cortical Signals Recorded in the EEG

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